METHOD FOR TESTING PARTS WITH HEAT-PROTECTIVE COVERING FOR DURABILITY Russian patent published in 2005 - IPC

FIELD: testing equipment.

SUBSTANCE: method includes several cycles of tests, each of which consist of three stages. On first stage temperature of part is increased during certain time to given value, at second stage for certain time value of this variable is preserved, at third - temperature of part is decreased to minimum given value during certain time using cooling air. Part durability is estimated on basis pf test cycles and form of defects. At first stage of cycle part is gradually heated up, firstly up to 0.1-0.4 of maximum given temperature, with minimal values of current and voltage, then voltage is increased up to maximum given value with heating of part up to 0.5-0.6 of maximal given temperature with minimal current and, increasing current to maximal given value, part is heat to maximal given temperature. At first and second stages heating of part is performed by high-frequency electromagnetic field, and to inside of part additional cooling air is fed during whole cycle of tests.

EFFECT: higher precision.

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